Schedule Of Computation of Earnings Per Share - Summary of Calculation of Basic Earnings Per Common Share and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 109,245	$ 79,424	$ 62,474	$ 37,291	$ 188,669	$ 99,765
Denominator:
Denominator for basic earnings per share-weighted average common shares	26,507		26,332		26,489	26,309
Dilutive effect of share-based awards	158		372		173	378
Denominator for diluted earnings per share-adjusted weighted average common shares	26,665		26,704		26,662	26,687
Basic Earnings Per Share	$ 4.12		$ 2.37		$ 7.12	$ 3.79
Diluted Earnings Per Share	$ 4.10		$ 2.34		$ 7.08	$ 3.74